Deferred Revenue (Details) - USD ($) $ in Millions	Sep. 30, 2015	Mar. 31, 2015
Current:
Total deferred revenue (billed or collected) - current	$ 1,870	$ 2,114
Noncurrent:
Total deferred revenue (billed or collected) - noncurrent	646	863
Total deferred revenue (billed or collected)	2,516	2,977
Subscription and Maintenance
Current:
Total deferred revenue (billed or collected) - current	1,727	1,966
Noncurrent:
Total deferred revenue (billed or collected) - noncurrent	620	832
Professional Services
Current:
Total deferred revenue (billed or collected) - current	106	115
Noncurrent:
Total deferred revenue (billed or collected) - noncurrent	24	28
Software Fees and Other
Current:
Total deferred revenue (billed or collected) - current	37	33
Noncurrent:
Total deferred revenue (billed or collected) - noncurrent	$ 2	$ 3